Winnipeg study finds mixed results
- Stanford, Duke, Michigan, and Penn researchers released the biggest U.S. school phone-ban study, tracking 43,000-plus schools using lockable Yondr pouches. - The bans sharply cut in-school phone use and teachers saw fewer distractions, but test scores, attendance, and cyberbullying measures barely moved overall. - The real lesson is that bans are not a fast academic fix, even as states keep tightening school phone rules.
School cellphone bans just got their biggest real-world test yet. And the answer is not “they work” or “they fail.” It’s messier than that. A new National Bureau of Economic Research paper tracked more than 43,000 U.S. middle and high schools over three years and found that locking phones away during the day really does reduce phone use — but the hoped-for academic payoff does not show up quickly. ### What exactly was studied? This was not a vibes-based survey or one district trying something for a semester. The researchers looked at schools using Yondr pouches — those magnetically locked sleeves students keep with them all day but cannot open until dismissal — and compared them with similar schools that had looser phone restrictions. They pulled together GPS ping data, teacher and student discipline records. ### Did the bans actually keep kids off phones? Yes — pretty clearly. That is the strongest result in the whole paper. GPS data and teacher reports both showed that strict pouch policies substantially reduced phone use during the school day. So if the goal is simply “get phones out of students’ hands during class,” the policy does that. ### So the bigger promises did not land right away. On average, the schools with strict bans did not see major improvements in test scores, attendance, classroom attention measures, or perceived cyberbullying. Teachers liked the quieter classrooms, but the broader student outcomes many advocates care about mostly stayed flat in the short term. ### Did anything get worse? At first, yes. In the first year, disciplinary incidents went up and student well-being went down. One widely cited detail is that suspensions rose by an average of 16 percent after strict bans started. Basically, schools got less phone use, but they also got an adjustment period that was rougher than many supporters expected. ### Did that rough patch last? Not entirely. By the third year, the discipline spike had faded and student well-being had moved above pre-ban levels. That matters because it suggests the early turbulence may be part of implementation rather than proof the idea is broken. The catch is that even with that longer runway, the study still did not find broad academic gains on average. ### Why doesn’t less phone use automatically mean better grades? Because attention is not a light switch. Taking away the distraction helps, but it does not instantly rebuild habits, classroom culture, or motivation. A phone-free room can still be a bored room. That seems to be the underlying story here — the policy takeaway from the pattern in the results, not a direct claim from the paper. ### Why does this matter right now? Because states have been moving fast. Over the past three years, about two-thirds of U.S. states have passed laws restricting phones in schools, and this study lands right in the middle of that policy wave. It gives lawmakers and school leaders a clearer answer: strict bans can change behavior fast, but the academic case is slower and less certain than the politics around the issue suggest. ### What should schools take from it? Treat a phone ban as a tool, not a cure. If a school wants calmer classrooms, locked pouches can help. But if the goal is better grades, attendance, or mental health, schools probably need the ban plus better teaching routines, clearer enforcement, and time for students to adjust. That is the bottom line — the phones matter, but they are not the whole problem.
